FastAPI in Layers: A Production Structure That...

Approx. 20 min read What started all of this was wanting to build an LLM-powered application. Not a toy. Something with real moving parts — a backend that could handle API calls, talk to a database, manage configuration, and eventually wire into an AI layer on top. I had a rough idea of what I wanted to build, but every time I sat down to start, I felt like I was building on sand. For the longest time before that, my API projects started clean and then quietly fell apart. Not broken — they worke